netdev - Re: [RFC] vxlan: convert remote list to list

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Message-ID: <OFF0160A91.9C9E7EC3-ON85257B80.00594BB9-85257B80.005A8D71@us.ibm.com>
Date:	Tue, 4 Jun 2013 12:29:05 -0400
From:	David Stevens <dlstevens@...ibm.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	Mike Rapoport <mike.rapoport@...ellosystems.com>,
	netdev@...r.kernel.org, netdev-owner@...r.kernel.org,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: [RFC] vxlan: convert remote list to list_rcu

Stephen Hemminger <stephen@...workplumber.org> wrote on 06/04/2013 
12:00:31 PM:

> I am still not 100% convinced of the use case of providing multiple 
> destinations.
> It seems like either a solution for migrating guests, a way to do 
> SPAN, or a weird
> form of multicast.

The use is, as you would say it, a weird form of multicast. It
is to allow forwarding MAC multicasts without relying on the
underlying network having multicast routers in the same domain.

> Wouldn't it be better to use something like TC actions for these 
> special cases and
> handle it at the IP layer rather than having to add so much 
> complexity into the
> VXLAN driver itself.

This isn't a "special case" for DOVE -- it is the mechanism
for doing MAC multicasts. I don't agree that the code is
complex -- it simply replaces what was a vxlan_rdst with a
list of vxlan_rdsts. And, no, I don't believe it can be
done with equivalent performance using external mechanisms.

Didn't we have this discussion when the patch went in?

                                                        +-DLS

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